Quote:
Originally Posted by yorkie_chris
I've read similar and am familiar with the various circuits and how they overlap.
On CV carb, point of low pressure moves as slider opens, carb transitions off idle circuit onto needle/mains.
I don't think you will notice any difference if idle was all over place but mains were ok. Case in point how many bikes do you see with loads of sh*te in the idle passageways that run fine when you get revved up.
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Doesn't really matter whether the slide is lifted by a cable or a vacuum, the same things happen with the jets.
Changing the amount of fuel delivered by the idle circuit has an effect throughout the range of operation. That's why you need to start there. Changing mid-range jets and needles, or changing the height of the needles has an effect on most of the main circuit. That's why you need to go there next, and leave the mains for last.
I guess it all depends on how well you want your bike to run. The effects of changing the idle circuit after you've changed the main jets might be small, but it also might be significant. Some of that depends on how you've jetted the mains. If you've set the mains right at the edge, either rich or lean, changing the idle mixture might just make it run poorly, or it might make it run better. Who knows? If it makes it run poorly, what do you do next? Go back and change the mains again?
All I know is, I learned from the carb manufacturer how to properly tune carbs. It not only makes sense, it works.